1131800028 has 12 divisors (see below), whose sum is σ = 2640866760. Its totient is φ = 377266672.

The previous prime is 1131800011. The next prime is 1131800029. The reversal of 1131800028 is 8200081311.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1131799980 and 1131800007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131800029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47158323 + ... + 47158346.

It is an arithmetic number, because the mean of its divisors is an integer number (220072230).

Almost surely, 2^1131800028 is an apocalyptic number.

It is an amenable number.

1131800028 is an abundant number, since it is smaller than the sum of its proper divisors (1509066732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131800028 is a wasteful number, since it uses less digits than its factorization.

1131800028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94316676 (or 94316674 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 1131800028 is about 33642.2357758815. The cubic root of 1131800028 is about 1042.1332040640.

Adding to 1131800028 its reverse (8200081311), we get a palindrome (9331881339).

The spelling of 1131800028 in words is "one billion, one hundred thirty-one million, eight hundred thousand, twenty-eight".